Home to a timed geyser created by complete accident.

A lava tube cooled to form this long tunnel that stays chilly even at the height of summer.

A legal loophole makes it possible to get away with murder within this 50-square-mile section of Yellowstone.

A creek tumbles over a series of step-like rocks to create this scenic water feature.

A former sanitarium where soldiers were sent to recover in the healing waters of hot springs.

This landmark is a central figure in the Nez Perce origin story.

Sweet Willy, at 30 feet tall, is the world's biggest beagle.

A museum dedicated to the history and art of staying clean.

This combination shop and museum is filled with curious items and artifacts.

This museum glorifies the humble potato.

This giant tower beacon was a key navigation tool for pilots delivering mail amid the night skies.

A petroglyph map of the upper Snake River carved by prehistoric hunter-gatherers.

The "Grand Canyon of Southwestern Idaho" makes a spectacular gash across the flat Snake River plain.

Birdhouses, peacocks, animal sculptures, and a graveyard are all found along this eclectic nature trail.

One of the "twins" in these falls on the Snake River was sacrificed for hydropower generation in the 1930s.

New Plymouth, Idaho is the only U-shaped town in the United States.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

Where the famed daredevil attempted to launch himself across a canyon in a custom-built rocket.

Rare and gorgeous birds abound in this protected wildlife sanctuary.

The only bridge in the United States where BASE jumping is legal without a permit year-round.

During World War II, over 13,000 people of Japanese ancestry were forcibly removed from their homes and incarcerated in this camp in the Idaho desert.

An impressive waterfall nestled in the cliffs of Idaho's Snake River Canyon.

A volcanic core jutting above the plain between the Snake and Boise Rivers, a marker identifies the reference point for all U.S. Government Surveys in Idaho.

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.